Yes, this happens, if you indeed changed any of "Scale" values, of the camera, you want to render from (Main Camera, Aux Camera .. etc .. )Check, and see, if all "Scale" values of the camera for X, Y, Z and Main are at 100%. If not, you have to correct them.Alternatively you can check the option "Allow Scaled Poser Cameras" in the Setup -> Configuration menu and save it.